Automatic brake device for industrial vehicle and industrial, vehicle having the same

Abstract

An automatic brake device for an industrial vehicle includes a brake pedal, a brake master cylinder, and an actuator that is operated during automatically braking, and configured to generate brake pressure in the brake master cylinder. The automatic brake device includes a first pivotable link member and a second pivotable link member. The brake pedal includes a pedal-side contact portion. The second pivotable link member includes a second link-side contact portion. The first pivotable link member includes a first contacted portion and a second contacted portion. The first pivotable link member is pivoted by the pedal-side contact portion pressing the first contacted portion while the brake pedal is stepped on, and pivoted by the second contacted portion pressing the second contacted portion while the actuator is operated.

What is claimed is: 
     
       1. An automatic brake device for an industrial vehicle comprising:
 a brake pedal that is pivotably supported by a bracket; 
 a brake master cylinder in which brake pressure is generated by the brake pedal stepped on; and 
 an actuator that is operated during automatically braking, and configured to generate brake pressure in the brake master cylinder, wherein 
 the automatic brake device includes:
 a first pivotable link member that is coupled to the brake master cylinder; and 
 a second pivotable link member that is coupled to the actuator, 
 
 the brake pedal includes a pedal-side contact portion that is configured to pivot the first pivotable link member, 
 the second pivotable link member includes a second link-side contact portion that is configured to pivot the first pivotable link member, 
 the first pivotable link member includes:
 a first contacted portion that is contactable with the pedal-side contact portion; and 
 a second contacted portion that is contactable with the second link-side contact portion, 
 
 the first pivotable link member is pivoted by the pedal-side contact portion pressing the first contacted portion while the brake pedal is stepped on, simultaneously the second contacted portion being moved away from the second link-side contact portion, and 
 the first pivotable link member is pivoted by the second link-side contact portion pressing the second contacted portion while the actuator is operated, simultaneously the first contacted portion being moved away from the pedal-side contact portion, and 
 
       wherein
 the automatic brake device includes a pivot shaft that pivotably supports the brake pedal, the first pivotable link member, and the second pivotable link member, 
 the first pivotable link member is fixed to the pivot shaft and pivotable with the pivot shaft, and 
 the automatic brake device further includes a pivot amount detector that is configured to detect an amount of pivoting of the pivot shaft. 
 
     
     
       2. The automatic brake device for the industrial vehicle according to  claim 1 , wherein the actuator is a hydraulic cylinder. 
     
     
       3. An industrial vehicle comprising
 the automatic brake device according to  claim 2 . 
 
     
     
       4. The automatic brake device for the industrial vehicle according to  claim 1 , wherein
 the first contacted portion provided on the first pivotable link member is positioned radially outwardly away from the pivot shaft to interfere with a pivoting track of the pedal-side contact portion, and 
 the second contacted portion provided on the first pivotable link member is positioned radially outwardly away from the pivot shaft to interfere with a pivoting track of the second link-side contact portion. 
 
     
     
       5. An industrial vehicle comprising
 the automatic brake device according to  claim 4 . 
 
     
     
       6. An industrial vehicle comprising
 the automatic brake device according to  claim 1 . 
 
     
     
       7. An industrial vehicle comprising
 the automatic brake device according to  claim 1 . 
 
     
     
       8. An automatic brake device for an industrial vehicle comprising:
 a brake pedal that is pivotably supported by a bracket; 
 a brake master cylinder in which brake pressure is generated by the brake pedal stepped on; and 
 an actuator that is operated during automatically braking, and configured to generate brake pressure in the brake master cylinder, wherein 
 the automatic brake device includes:
 a first pivotable link member that is coupled to the brake master cylinder; and 
 a second pivotable link member that is coupled to the actuator, 
 
 the brake pedal includes a pedal-side contact portion that is configured to pivot the first pivotable link member, 
 the second pivotable link member includes a second link-side contact portion that is configured to pivot the first pivotable link member, 
 the first pivotable link member includes:
 a first contacted portion that is contactable with the pedal-side contact portion; and 
 a second contacted portion that is contactable with the second link-side contact portion, 
 
 the first pivotable link member is pivoted by the pedal-side contact portion pressing the first contacted portion while the brake pedal is stepped on, simultaneously the second contacted portion being moved away from the second link-side contact portion, and
 the first pivotable link member is pivoted by the second link-side contact portion Dressing the second contacted portion while the actuator is operated, simultaneously the first contacted portion being moved away from the pedal-side contact portion, wherein 
 the actuator is a hydraulic cylinder, and wherein 
 
 the automatic brake device includes a pivot shaft that pivotably supports the brake pedal, the first pivotable link member, and the second pivotable link member, 
 the first pivotable link member is fixed to the pivot shaft and pivotable with the pivot shaft, and 
 the automatic brake device further includes a pivot amount detector that is configured to detect an amount of pivoting of the pivot shaft.